Method and apparatus for continuous in-line gas treatment of...

C - Chemistry – Metallurgy – 22 – B

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C22B 9/05 (2006.01) C21C 7/072 (2006.01) C22B 21/06 (2006.01)

Patent

CA 2221194

A method of and apparatus for treating molten metal to achieve effective removal of such unwanted inclusions as gases, alkali metals, entrained solids, and the like. The method comprises continuously introducing molten metal into a container forming a trough or trough section, such as the trough provided between a melting furnace and a casting machine, providing at least one mechanically movable gas dispenser (11) submerged within the metal (15) in the container and introducing a gas into the metal adjacent to a gas disperser (14) in a part of the trough forming a treatment zone such that the gas is broken into smaller bubbles by the gas dispenser (11) and dispersed through the treatment zone. The trough or trough section is such that it exhibits a metal holdup of less than 50 %.

L'invention concerne un procédé et un dispositif permettant de traiter un métal en fusion afin d'en éliminer, de façon efficace, des inclusions non désirées telles que des gaz, des métaux alcalins, des solides entraînés ou similaires. Le procédé consiste à introduire en continu le métal en fusion dans un récipient formant une cuve ou une section de cuve, telle que la cuve se trouvant entre un four à fusion et une machine de coulée, à utiliser au moins un distributeur de gaz (11) pouvant être déplacé mécaniquement, qui est immergé dans le métal (15) se trouvant dans le récipient, et à introduire un gaz dans le métal se trouvant à proximité d'un disperseur de gaz (14) dans une partie de la cuve formant une zone de traitement, de sorte que le gaz est fragmenté en bulles plus petites par le distributeur de gaz (11) et dispersé à travers la zone de traitement. La cuve ou la section de cuve a une capacité de retenue du métal inférieure à 50 %.

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